JPS6441077A - Adaptive forward differential apparatus and method for displaying curve on display device by starting display element for formation of curve - Google Patents

Adaptive forward differential apparatus and method for displaying curve on display device by starting display element for formation of curve

Info

Publication number
JPS6441077A
JPS6441077A JP63110640A JP11064088A JPS6441077A JP S6441077 A JPS6441077 A JP S6441077A JP 63110640 A JP63110640 A JP 63110640A JP 11064088 A JP11064088 A JP 11064088A JP S6441077 A JPS6441077 A JP S6441077A
Authority
JP
Japan
Prior art keywords
curve
pixel
high degree
circuit
current
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP63110640A
Other languages
Japanese (ja)
Other versions
JP2741033B2 (en
Inventor
Rin Rien Shiyuu
Jiei Shiyantsu Maikeru
Erujiin Serudaa
Aaru Puratsuto Buoohan
Aaru Ebuanzu Jierarudo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sun Microsystems Inc
Original Assignee
Sun Microsystems Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sun Microsystems Inc filed Critical Sun Microsystems Inc
Publication of JPS6441077A publication Critical patent/JPS6441077A/en
Application granted granted Critical
Publication of JP2741033B2 publication Critical patent/JP2741033B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T11/00—2D [Two Dimensional] image generation
    • G06T11/20—Drawing from basic elements, e.g. lines or circles
    • G06T11/203—Drawing of straight lines or curves
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/20—Function-generator circuits, e.g. circle generators line or curve smoothing circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Image Generation (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

PURPOSE: To display accurately a high degree curve and a high degree curved face on a display device by providing a means receiving plural data points representing display elements forming a video image and a means displaying the curve incrementally in nearly uniform 1-pixel step. CONSTITUTION: An adaptive forward difference unit(AFDU) circuit 12 provides an output of a current X coordinate to a multiplier 20, in which the current X coordinate is multiplied by a corresponding 1/w value outputted from a 1/w circuit 18. Thus, the current X/w is fed to a pixel filter 30. Similarly Y/w and Z/w are are fed to the pixel filter 30 from AFDU circuits 10, 14, 16, the 1/w circuit 18 and multipliers 22, 24. Thus, X, Y, Z coordinates of a rational cubic function are outputted to the pixel filter 30 and a video image of the rational cubic function is used to select a pixel to be formed on a CRT. Thus, a high degree curve or curved face is accurately displayed.
JP63110640A 1987-05-08 1988-05-09 Adaptive forward difference apparatus and method for displaying a curve on a display by activating a display element that forms the curve Expired - Fee Related JP2741033B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US4769687A 1987-05-08 1987-05-08
US047,696 1987-05-08

Publications (2)

Publication Number Publication Date
JPS6441077A true JPS6441077A (en) 1989-02-13
JP2741033B2 JP2741033B2 (en) 1998-04-15

Family

ID=21950428

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63110640A Expired - Fee Related JP2741033B2 (en) 1987-05-08 1988-05-09 Adaptive forward difference apparatus and method for displaying a curve on a display by activating a display element that forms the curve

Country Status (8)

Country Link
US (1) US5125073A (en)
JP (1) JP2741033B2 (en)
CA (1) CA1312154C (en)
DE (1) DE3815390C2 (en)
FR (1) FR2615980B1 (en)
GB (1) GB2204767B (en)
HK (1) HK91092A (en)
SG (1) SG41692G (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03269686A (en) * 1990-03-19 1991-12-02 Fujitsu Ltd Generation processing system for high quality curve

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2646257B1 (en) * 1989-04-24 1991-08-23 Digital Equipment Int METHOD FOR DISPLAYING ARCS OF POLYNOMIAL PARAMETRIC CURVES ON A DISPLAY MEDIUM OF A DISPLAY MEANS CONNECTED TO A COMPUTER
KR930004215B1 (en) * 1990-11-16 1993-05-21 고재용 Digital hardware apparatus and digial data processing method
US5367617A (en) * 1992-07-02 1994-11-22 Microsoft Corporation System and method of hybrid forward differencing to render Bezier splines
US5488698A (en) * 1992-11-05 1996-01-30 Oliver; David C. Rasterization of line segments using difference vectors
US5739820A (en) * 1992-11-19 1998-04-14 Apple Computer Inc. Method and apparatus for specular reflection shading of computer graphic images
US5473740A (en) * 1993-12-29 1995-12-05 International Business Machines Corporation Method and apparatus for interactively indicating image boundaries in digital image cropping
US7245299B2 (en) * 2003-05-12 2007-07-17 Adrian Sfarti Bicubic surface real-time tesselation unit
USRE42534E1 (en) * 2000-07-28 2011-07-12 Adrian Sfarti Bicubic surface real-time tesselation unit
KR102219294B1 (en) 2014-02-13 2021-02-23 삼성전자 주식회사 Method and apparatus for rendering curve

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3598972A (en) * 1968-12-23 1971-08-10 Texas Instruments Inc Adaptive weighting in training feedback minimized optimum filters and predictors
JPS6040042B2 (en) * 1975-07-17 1985-09-09 日本電気株式会社 High-speed and high-precision interpolation method
DE2738352A1 (en) * 1977-08-23 1979-03-01 Siemens Ag FUNCTION GENERATOR WITH MEMORY MATRIX
US4371933A (en) * 1980-10-06 1983-02-01 International Business Machines Corporation Bi-directional display of circular arcs
NL8300872A (en) * 1983-03-10 1984-10-01 Philips Nv MULTIPROCESSOR CALCULATOR SYSTEM FOR PROCESSING A COLORED IMAGE OF OBJECT ELEMENTS DEFINED IN A HIERARCHICAL DATA STRUCTURE.
US4620287A (en) * 1983-01-20 1986-10-28 Dicomed Corporation Method and apparatus for representation of a curve of uniform width
US4730261A (en) * 1983-10-25 1988-03-08 Ramtek Corporation Solids modelling generator
JPH0631990B2 (en) * 1984-01-07 1994-04-27 カシオ計算機株式会社 Waveform interpolator
US4688182A (en) * 1984-09-10 1987-08-18 Allied Corporation Method and apparatus for generating a set of signals representing a curve
US4760548A (en) * 1986-06-13 1988-07-26 International Business Machines Corporation Method and apparatus for producing a curve image

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03269686A (en) * 1990-03-19 1991-12-02 Fujitsu Ltd Generation processing system for high quality curve

Also Published As

Publication number Publication date
JP2741033B2 (en) 1998-04-15
DE3815390C2 (en) 1997-08-14
DE3815390A1 (en) 1988-11-24
US5125073A (en) 1992-06-23
GB2204767B (en) 1991-11-13
GB2204767A (en) 1988-11-16
HK91092A (en) 1992-11-27
CA1312154C (en) 1992-12-29
SG41692G (en) 1992-06-12
GB8809350D0 (en) 1988-05-25
FR2615980B1 (en) 1994-04-01
FR2615980A1 (en) 1988-12-02

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees